(!!!!) (Best Pair #1) 7868 Sylvania tipped top used/tests like new 1960's (65ma and 66ma) (strong mA and Gm)1 pair) 7868 Sylvania tipped top used tests like new 1960's 1 tube) 65mA Gm=10,400 Sylvania used tests like new 1 tube) 66ma Gm=10,900 Sylvania Bogen like new Tested on Amplitrex Good Ma range 50 60ma Good Gm range 9,000 10,000 Recommended for Ampeg Reverberocket R 12R 1965 Ampeg Jet 12 1960's Fisher Model 400 FM Multiplex Receiver Fisher X 100B Bogen